Mobile Office System

ABSTRACT

A mobile office system provides a portable, convenient, and efficient framework for setting up communication devices, establishing connectivity, and delivering interactive presentations. The mobile office system includes a portable component carrier. Inside the portable component carrier are component placement structures that define placement locations at which the specific components of the mobile office may be placed, stored, and secured. As one example, the component placement structures may define slots configured to securely hold tablet computers in place during movement of the portable component carrier.

TECHNICAL FIELD

This disclosure relates to mobile wireless office setup and configuration.

BACKGROUND

Rapid advances in communication technologies, driven by immense customer demand, have resulted in the widespread adoption of mobile communication devices. Many of these devices, e.g., tablet computers, support multiple different wireless communication protocols, such as 802.11a/b/g/n/ac/ad (or other variants of WiFi), Bluetooth, and other protocols. These advances have made it more complex and therefore more difficult to quickly setup such devices, configure their communication interfaces for secure and controlled communications, and collaboratively engage the devices in a controlled exchange of information.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a portable component carrier for a mobile office system with devices removed.

FIG. 2 shows a portable component carrier for a mobile office system with devices inserted.

FIG. 3 shows the portable component carrier nearly closed.

FIG. 4 shows a bottom compartment for a portable component carrier.

FIG. 5 shows a top compartment for a portable component carrier.

FIG. 6 shows a method for constructing a portable component carrier.

FIG. 7 shows empty shell compartments of a portable component carrier.

FIG. 8 shows a perspective view of the portable component carrier.

DETAILED DESCRIPTION

FIG. 1 shows an example of a portable component carrier (“carrier”) 100 for a mobile office system. FIG. 8 shows a perspective view 800 that helps to illustrate depth for the carrier 100 shown in FIG. 1, and its compartments. The carrier 100 provides a self-contained solution that houses, in a compact case, a set of components and devices that may be used to deliver a presentation, power and recharge the communication devices used in the presentation, provide audio output, network the communication devices together, and perform other functions. The carrier 100 may vary widely in size, shape, and configuration. In one implementation, the carrier 100 has a form factor compliant with overhead luggage measurements acceptable for U.S. or international airline flights. In other implementations, the carrier 100 may be larger, e.g., when additional components are included in the system, or smaller, e.g., when fewer components are included in the system.

The carrier 100 greatly facilitates setting up and executing presentations on wireless communication devices, as well as updating presentations. The carrier 100 may include a set of devices that provide a variety of ways to give presentations, e.g., via tablet computers or via a projector, and the presentation may include both audio and video components. The devices in the carrier 100 support a controlled presentation for multiple people for any given length of time, e.g., for 22 or more people for 90 or more minutes. In addition, the devices in the carrier 100 may include a data collection device configured to collect attendance and survey data.

The wireless communication devices may be tablet computers, cellular phones, netbooks, or any other device that supports wireless communication over 802.11a/b/g/n/ac/ad (or other variants of WiFi), Bluetooth, or any other protocol. The wireless communication devices may be assigned roles for the purposes of the presentation, such as a presenter role and a receiver role. In the presenter role, a wireless communication device may transmit the audio/visual data for the presentation to any number of receivers. The wireless communication devices in the receiver role may then receive and play back the audio/visual data in synchronism with the presenter. As just one example, the wireless communication devices may implement presentation sharing capability provided by, e.g., the Idea Flight presentation sharing solution available from Conde Nast, but other presentation delivery mechanisms may be used.

FIG. 1 shows the carrier 100 with the devices and components removed. The carrier 100 includes a first compartment 102, a second compartment 104, and a coupling 150 between the first compartment 102 and the second compartment 104 that permits the first compartment 102 and the second compartment 104 to close together. The coupling 150 may be one or more hinges, for instance. The coupling 150 may allow the first compartment 102 and the second compartment 104 to close upon one another, e.g., in the same manner as a suitcase. The first compartment 102 may be referred to or considered as the bottom compartment and the second compartment 104 may be referred to or considered as the top compartment of the carrier 100. However, the labels “top” and “bottom” are simply used as reference points for describing the structure of the carrier 100, and other labels may be given instead.

The first compartment 102 and second compartment 104 may be configured in many different ways. One particular configuration is provided below. However, any carrier may define other arrangements, positions, and locations for the devices and components of the system.

The first compartment 102 includes multiple individual wireless communication device component placement structures (e.g., 106, 108, 110). These structures may be sequentially arranged in an array 112 that defines a wireless communication device storage section 114 within the first compartment 102. In this example, the structures are individual fingers of material (e.g., foam) that partially extend into the cavity 122 to engage and secure the wireless communication devices. The wireless communication device component placement structures define individual wireless communication device placement locations (e.g., 116, 118, 120) that securely hold the wireless communication devices, e.g., via an interference fit against adjacent fingers. The placement locations are, in this example, apertures into which tablet computers may be inserted.

The wireless communication device storage section 114 is adapted to store multiple instances of the same or different pre-determined wireless communication devices, for instance a tablet computer. In the example in FIG. 1, the array 112 secures 11 tablet computers, but the array 112 may be modified to store additional or fewer tablet computers (or any other wireless communication device).

The first compartment 102 may also include a speaker component placement structure 124, e.g., adjacent to the wireless communication device storage section 114. The speaker component placement structure 124 defines a speaker placement location 126 adapted to receive a speaker. The speaker may be virtually any type of speaker, such as a portable powered Bluetooth speaker. The speaker component placement structure 124 may be implemented as foam walls that define the speaker placement location 126, and that may provide an interference fit against the speaker to help secure the speaker in place. FIG. 8 includes shading to indicate where foam may be provided to define the component placement structures used in the carrier 100, including as just one example the speaker component placement structure 124.

The first compartment 102 may also include a cable component placement structure 128, e.g., adjacent to the speaker component placement structure 124. The cable component placement structure 128 defines a cable placement location 130 adapted to receive, e.g., electrical cables or other components, for any of the devices in the carrier 100. The cable component placement structure 128 may be implemented as foam walls that define the cable placement location 130. In some implementations, a cover (e.g., a corrugated plastic piece) may be provided to sit over or on top of the cable placement location 130. Further, a strap may be provided to secure the cover in place over the cable placement location 130 to facilitate retaining the components in the cable placement location 130.

The first compartment 102 may also include a charging component placement structure 132, e.g., adjacent to at least one of the multiple wireless communication device component placement structures, the speaker component placement structure 124, and the cable component placement structure 128. The charging component placement structure 132 defines a charging placement location 134 adapted to receive charging modules, power strips for the charging modules, or any other components that facilitate charging the wireless communication devices. In the example shown in FIG. 1, the charging component placement structure 132 is formed on one side by a foam wall 135, and on the other sides by wall sections of the first compartment 102.

The second compartment 104 includes a wireless networking router component placement structure 152 defining a wireless networking router placement location 154 adapted to receive a pre-determined wireless networking router. Note that the wireless networking router placement location 154 extends across the width and height of the opening defined by the wireless networking router component placement structure 152. In addition, the second compartment 104 includes a projector component placement structure 156. In this example, the projector component placement structure 156 is located underneath the wireless networking router component placement structure 152, thereby forming a multiple level component placement structure arrangement. The projector component placement structure 156 defines a projector placement location 158 adapted to receive a video projector. Accordingly, when stored, the projector rests underneath the wireless networking router. A buffer layer (e.g., of foam or padding) may be added on top of the projector to help buffer the projector from the wireless network router. There may be foam, padding, or both underneath all or part of the projector to provide a buffer for the projector. For instance, FIG. 1 shows a foam area 166, and a padding area 168, each covering a portion of the bottom of the projector component placement location 158.

The second compartment 104 also includes a stand component placement structure 160 defining a stand placement location 162. The stand placement location 162 is adapted to receive stands for the wireless communication devices. A cover, e.g. a corrugated plastic piece, may be provided to cover the stands. In addition, a strap may be provided to secure the cover over the stand placement location 162 to facilitate retaining the stands in the stand placement location 162.

As noted above, the wireless communication device component placement structures define individual wireless communication device placement locations. The individual wireless communication device placement locations may have a depth selected to leave exposed a charging port on the wireless communication device, when the wireless communication device is inserted into the individual wireless communication device placement location. More generally, the wireless communication device component placement structures may have a depth that leaves exposed a portion of the pre-determined wireless communication device when the pre-determined wireless communication device is inserted into the individual wireless communication device placement location. In that regard, the second compartment 104 may also include an opening 164 adapted to receive, when the portable component carrier 100 is closed, the portions of the pre-determined wireless communication devices that are exposed.

There are many ways in which the carrier may be constructed. For instance, starting with empty compartments 102 and 104, relatively rigid foam inserts may be fabricated and inserted into the compartments to define the placement structures and placement locations. Materials other than foam may be used. The straps may be secured to the compartments at locations underneath the foam inserts. The straps may include hook and loop or other fasteners to secure the straps in place over the components and devices. In one implementation the strap for the cover for the cable placement location 130 is sized to also accept, underneath the strap, a data collection device (e.g., a separate tablet computer) that may collect attendance, survey, or any other data relevant to the presentation.

FIG. 2 shows a view of the first compartment 102 and the second compartment 104 with devices and components in place in their placement locations. In the first compartment 102 are tablet computers 202 secured in the individual wireless communication device placement locations, a wireless powered speaker 204 secured in the speaker placement location, a data collection device 206 secured under the strap 208 over the cable placement location. Also shown is a portion of the cover 210 over the cable placement location, as well as power strips 212 and charging modules 214 in place in the charging placement location. Note that the power strips 212 may be selected to have power sockets oriented in a manner that allows the charging modules 214 to plug into the power strip simultaneously. In other words, the power sockets support simultaneously connection by a set of charging modules 214, and in turn recharging by multiple wireless communication devices at the same time (and without being removed from their placement locations). As shown in FIG. 2, the power strips have six power sockets oriented so that six USB chargers may simultaneously plug into the power strips.

In the second compartment 104 is the wireless networking router 216, secured in the wireless networking router placement location. A strap 218 helps to secure the wireless networking router in place. Underneath the wireless networking router 216 is a portable projector secured in the projector placement location. A strap 220 is also shown that helps secure the stands in place in the stand placement location 158.

FIG. 3 shows the carrier 100 with the compartments nearly closed. The carrier 100 may include wheels 302 to facilitate convenient transport of the carrier. Wheels are not required, however.

FIG. 4 shows another view 400 of a bottom compartment 402 for a portable component carrier. FIG. 4 also shows a structural (e.g., foam) insert 404. The structural insert 404 may be separately fabricated and attached into an empty shell compartment 406 in order to provide any desired component placement structures for the carrier.

Further, padding may be present under any of the component placement structures. FIG. 4 shows example padding thicknesses: ½ inch under the charging component placement structure 132, ¼ inch under the wireless communication device component placement structures, ¾″ under the speaker component placement structure 124, and ¼ inch under the cable component placement structure 128.

Any of the padding may be configurable in thickness. For instance, the case 100 may include additional pads (e.g., 408 and 410) of any thickness that fit into the wireless communication device component placement locations. Adding pads to the bottom of the placement locations adjusts the depth of the placement locations, and allows for placement locations that adapt to any particular device. As a specific example, when a less wide wireless communication device is stored in the case 100, additional pads may be inserted to raise the wireless communication device and thereby, e.g., keep a charging port exposed, or keep exposed a pre-determined portion of the wireless communication device to facilitate insertion into and removal the component placement structure.

FIG. 5 shows another view of a top compartment 502 for a portable component carrier. FIG. 5 also shows a structural (e.g., foam) insert 504. All or some of the structural inserts 404 and 504 may be made with different materials. For instance, the structural insert 504 includes a corrugated plastic wall 508 inserted between the foam sections 510 and 512 in order to help define the stand component placement structure 160. As with the insert for the bottom compartment 402, the structural insert 504 may be separately fabricated and attached into an empty shell compartment 506 in order to provide any desired component placement structures for the carrier.

Again, padding may be present under any of the component placement structures. FIG. 5 shows an example padding thickness of ¼ inch under the projector component placement structure 156. Padding may also be added under the opening 164 to provide a buffer for the exposed portions of the wireless communication devices when the compartments are closed. FIG. 5 also shows the buffer layer 514 that may be added on top of the projector to help buffer the projector from the wireless network router that sits on top. An access cavity 516 may be defined adjacent to the buffer layer 514 or projector component placement structure 156 to provide an area into which fingers or tools may be inserted to help remove the buffer layer 514 or projector. A structure cavity 518 may be defined to accommodate projector structure, such as the projector lens.

FIG. 6 shows a method 600 for constructing a portable component carrier, e.g., a method that a manufacturer may implement to build portable component carriers. The method 600 may include providing a closeable case (602), e.g., a suitcase including a top compartment and a bottom compartment connected by a hinge. The method 600 may also include stripping out the interior of the case in order to provide shell compartments (e.g., the shell compartments 406 and 506). FIG. 7 shows an example of empty shell compartments 700 in a portable component carrier. Continuing the example shown in the Figures above, FIG. 7 provides a view of the empty shell compartment 406 that will become the first compartment 102, and a view of the empty shell compartment 506 that will become the second compartment 104.

in which component placement structures may be defined, inserted, or otherwise provided. In that respect, the method 600 includes determining which component placement structures to implement in the shell compartments (606).

Several examples are given in FIG. 6, but note that a component carrier may be configured to securely hold any selected devices or components. For instance, when the carrier will hold wireless communication devices (608), the manufacturer may provide, within the carrier, a wireless communication device component placement structure (e.g., structures 106, 108, 110) in any desired shell compartment (610). Similarly, when the carrier will hold a wireless networking router (612), the manufacturer may provide, within the carrier, a wireless networking router device component placement structure (e.g., the structure 152) in any desired shell compartment (610).

As another example, when the carrier will hold a projector (616), the manufacturer may provide a projector component placement structure (e.g., the structure 156) in any desired shell compartment (610). When the carrier will hold a speaker (620), the manufacturer may provide a speaker component placement structure (e.g., the structure 124) in a selected shell compartment (622). Similarly, when the carrier will hold cables (624), chargers (628), or stands (632), the manufacturer may implement cable component placement structures (e.g., the structure 128) (626), charger component placement structures (e.g., the structure 132) (630), or stand component placement structures (e.g., the structure 160) (634). Of course, a manufacturer may determine to store any other device or component in the carrier (636), and provide corresponding component placement structure (638).

Table 1, below, summarizes a specific example implementation of the carrier 100.

TABLE 1 Quantity Item Description 1 Case The case provides component placement structures that securely house the components that implement a portable office, a disaster recovery emergency off site support system, or other communication system. The case may be a rugged, framed 100% Polycarbonate construction to provide a combination of strength, flexibility, and capacity. Four smooth rolling dual wheels facilitate movement of the case. Overall Dimensions: 21″ × 15″ × 10″, as one example, though the case may be larger or smaller depending on the desired application and the set of devices and component that the case will hold. 12 Wireless communication The wireless communication devices provide devices paperless presentations, knowledge data, collaborating devices, and data collection functionality. 2 Charging Power The charging power strips may be used in Strips conjunction with the wireless communication device power adapters for charging. The charging power strips may be selected to allow all charging adapters to be plugged in at the same time providing charging power to all wireless communication devices at the same time. Note that any of the power strips may have power sockets oriented so that multiple (e.g., 6) chargers for the wireless communication devices may be simultaneously inserted to support charging multiple wireless communication devices simultaneously. 12 Tablet Power The table power adapters convert AC power Adapters provided through the power strips to the charging voltage used to charge the wireless communication devices. 1 Powered portable The speakers provide reliable acoustic output compact speaker while displaying video in conjunction with the E.g., a BIG projector. The speakers may also connect JAMBOX(TM) mobile voice devices via Bluetooth and to Wireless Speaker broadcast teleconference capabilities. The speaker may include a self-contained rechargeable battery. 12 Stands Portable lightweight stands for the wireless communication devices. 1 USB A to Mini-B This cable may provide connectivity from the Cable speaker to a computer for firmware and other software upgrades. 1 Wireless networking The wireless networking device may be, as one device, e.g., a example, an enterprise grade broadband router. CraddlePoint ARC The device may provide a local area network MBR1400 with connection to a wide area network (WAN). The embedded AT&T WAN can be a larger computer network, or the 3G/4G Modem Internet. The wireless networking device may be configured with any desired types of antennas, such as 5 GHz external antennas, for improved reception and connection reliability. 1 Projector, e.g., an A projector (e.g., a handheld projector, a pocket Optoma ML550 projector, mobile projector, pico projector or mini beamer) for large format display. The projector may generate a larger display than that provided by portable devices such as mobile phones, personal digital assistants, and digital cameras, which have sufficient storage capacity to handle presentation materials but little space to accommodate an attached display screen. The projector delivers digital video media to groups along with static presentations. 1 HDMI to HDMI Cable The HDMI cable may be used to transmit the video signals from a wireless communication device to the projector in high resolution. 1 Lightweight Camera The tripod may be included in the case for use in Tripod, e.g., Pedco conjunction with the projector. Ultrapod II lightweight Camera Tripod 1 36″ (0.9 mm) 3.5 mm The stereo cable may be used for the speaker. It Stereo Cable may be used as a fallback if Bluetooth connectivity fails. 13 USB Charging cables The charging cables charge the wireless communication devices. 1 Powered speaker This charger may charge and/or provide power charger to the portable speaker. 1 Wireless networking This adapter provides power to the wireless device power adapter networking device. 1 Projector power This adapter provides power to the portable Pico adapter projector. 1 VGA Projector Cable This cable may be used in place of the HDMI cable to provide VGA display. 1 Projector Remote A wireless remote control for the projector. Control

Table 2, below, provides example dimensions for the component placement structures.

TABLE 2 Structure Description Notes charging Storage cavity for component charging strips placement and charging structure adapters e.g., 20″ × 2.75″ stand Storage cavity for For instance, this space may be sized to accept component portable tablet 12 folded plastic stands that are then covered placement stands with a strip of corrugated plastic and 2″ strap structure e.g., 14.25″ × 2.5″ with hook and loop fastener to secure the stands in place when in transport. wireless area for the The projector component placement structure networking wireless and the wireless networking router component router networking placement structure are stacked to provide two component device vertically offset storage locations in one area. placement e.g., 10.5″ × 9″ structure projector area for the component projector placement e.g., 8.5″ × 6.75″ structure cable Cavity for storing This area may hold any desired charging cables, component cables, charging USB cables, tripod, power adapters, and other placement adapters, and components. The area may be secured with a structure other fitted piece of corrugated plastic and 2″ hook and components loop to maintain closure when the case is in 10″ × 4.75″ transport. All the cables may be wrapped with cable management Velcro Reusable Self-Gripping Cable Ties. Also, the USB cables may be wrapped with Grey Polyethylene Spiral Wrap. If there are no tables or other furniture available to prop up the projector, the case itself and the included tripod may be used. With the case closed and upright, the tripod with projector may be securely strapped to the top of the case, raising the projector to approx. 30″ off of the floor.

In one implementation, the component placement structures are fabricated from Polyethylene Foam 21 b. The opening 164 may be defined with a Cross-Linked Polyethylene Foam 21 b measuring approximately 10.5″×8.25″ to provide additional protection for the wireless communication devices when carrier 100 is closed.

Various implementations have been specifically described. However, many other implementations are also possible. For example, different types of foam with differing density, composition, and resiliency may securely hold the components in place. As another example, the foam may have different colors at different locations to help guide the identification of components, e.g., foam of a particular color for the components to remove first, or foam of a particular color to identify components related to chargers. As yet another example, the overall size and shape of the kit may vary widely to provide more or less room for additional passenger components, chargers, stands, and the like. 

What is claimed is:
 1. A system comprising: a portable component carrier; and within the portable component carrier: a wireless communication device component placement structure defining an individual wireless communication device placement location adapted to hold a pre-determined wireless communication device; and a wireless networking router component placement structure defining a wireless networking router placement location adapted to receive a pre-determined wireless networking router.
 2. The system of claim 1, where: the wireless communication device component placement structure is one of multiple individually defined wireless communication device component placement structures within the portable component carrier.
 3. The system of claim 2, where: the wireless communication device component placement structures are sequentially arranged in an array that defines a wireless communication device storage section within the portable component carrier adapted to store multiple instances of the pre-determined wireless communication device.
 4. The system of claim 1, where: the individual wireless communication device placement location has a depth selected to leave exposed a charging port on the pre-determined wireless communication device when the pre-determined wireless communication device is inserted into the individual wireless communication device placement location.
 5. The system of claim 1, where: the wireless communication device component placement structure has a depth that leaves exposed a portion of the pre-determined wireless communication device when the pre-determined wireless communication device is inserted into the individual wireless communication device placement location.
 6. The system of claim 5, where: the portable component carrier comprises a first compartment and a second compartment connected together by a hinge; the wireless communication device component placement structure is located in the first compartment; and the second compartment comprises an opening adapted to receive, when the portable component carrier is closed, the portion of the pre-determined wireless communication device that is exposed.
 7. The system of claim 6, further comprising: padding in the opening adapted to buffer, when the case is closed, the portion of the pre-determined wireless communication device.
 8. The system of claim 1, further comprising, within the portable component carrier: a speaker component placement structure defining a speaker placement location adapted to receive a speaker.
 9. The system of claim 1, further comprising, within the portable component carrier: a projector component placement structure defining a projector placement location adapted to receive a video projector.
 10. The system of claim 1, further comprising, within the portable component carrier: a charging component placement structure defining a charging placement location adapted to receive charging modules, power strips for the charging modules, or both to facilitate charging for the wireless communication devices.
 11. The system of claim 1, further comprising, within the portable component carrier: a stand component placement structure defining a stand placement location adapted to receive stands for the wireless communication devices.
 12. The system of claim 1, further comprising, within the portable component carrier: a cable component placement structure defining a cable placement location adapted to receive electrical cables for the wireless communication devices.
 13. A method comprising: providing a portable component carrier; and providing within the portable component carrier: a wireless communication device component placement structure defining an individual wireless communication device placement location adapted to hold a pre-determined wireless communication device; and a wireless networking router component placement structure defining a wireless networking router placement location adapted to receive a pre-determined wireless networking router.
 14. The method of claim 13, where providing the wireless communication device component placement structure comprises: providing multiple individually defined wireless communication device component placement structures within the portable component carrier.
 15. The method of claim 14, where providing the multiple wireless communication device component placement structures comprises: providing multiple wireless communication device component placement structures sequentially arranged in an array that defines a wireless communication device storage section within the portable component carrier adapted to store multiple instances of the pre-determined wireless communication device.
 16. The method of claim 13, where providing the wireless communication device component placement structure comprises: providing a depth of the wireless communication device component placement structure that leaves exposed a portion of the pre-determined wireless communication device when the pre-determined wireless communication device is inserted into the individual wireless communication device placement location.
 17. The method of claim 16, where providing the portable component carrier comprises: providing a first compartment and a second compartment connected together by a hinge; and further comprising: locating the wireless communication device component placement structure in the first compartment; and providing in the second compartment an opening adapted to receive, when the portable component carrier is closed, the portion of the pre-determined wireless communication device that is exposed.
 18. A system comprising: a first compartment; a second compartment; and a coupling between the first compartment and the second compartment that permits the first compartment and the second compartment to close together; the first compartment comprising: multiple individual wireless communication device component placement structures sequentially arranged in an array that defines a wireless communication device storage section within the first compartment adapted to store multiple instances of a pre-determined wireless communication device; a speaker component placement structure adjacent to the wireless communication device storage section and defining a speaker placement location adapted to receive a speaker; a cable component placement structure adjacent to speaker component placement structure and defining a cable placement location adapted to receive electrical cables for the pre-determined wireless communication devices; and a charging component placement structure adjacent to at least one of the multiple wireless communication device component placement structures, the speaker component placement structure, and the cable component placement structure, the charging component placement structure defining a charging placement location adapted to receive charging modules, power strips for the charging modules, or both, to facilitate charging for the wireless communication devices; and the second compartment comprising: a wireless networking router component placement structure defining a wireless networking router placement location adapted to receive a pre-determined wireless networking router; and a projector component placement structure located underneath the wireless networking router component placement structure, the projector component placement structure defining a projector placement location adapted to receive a video projector.
 19. The system of claim 18, where: the multiple individual wireless communication device placement structures each have a depth selected to leave exposed a charging port on the pre-determined wireless communication device when the pre-determined wireless communication device is inserted into any of the individual wireless communication device placement structures.
 20. The system of claim 18, where: the multiple individual wireless communication device placement structures each have a depth selected to leave exposed a portion of the pre-determined wireless communication device when the pre-determined wireless communication device is inserted into any of the individual wireless communication device placement structures; and the second compartment further comprises an opening adapted to receive, when the first compartment and second compartment are closed, the portion of the pre-determined wireless communication device that is exposed, for each pre-determined wireless communication device stored in the first compartment. 